INNOVATIVE ACOUSTIC SOLUTIONS www. alphacoustic.com POLYFON-BT : An innovative broadband acoustic Bass Trap panel that combines Sound Absorption & Diffusion characteristics. It consists of the POLYFON-BT Base and the Diffuser Membrane (DM). Bass Trap Acoustic Panel LOW FREQUENCY ABSORPTION & DIFFUSION PROPERTIES Description POLYFON-BT Base, is polyurethane, flexible foam, corner type panel, with a sculpted design, that effectively absorbs the sound energy and reduces the reverberation time. The addition of cavities (like Helmholtz resonators) offers maximum sound absorption efficiency. Foam triangular-shaped bass traps POLYFON-BT, are a cost effective solution for a reliable sound absorption. It can be installed into room corners and/or wall or ceiling junction, to provide significant low frequency sound absorption. The acoustic energy is dissipated as heat in the foam cells. Utilizing the depth of the corner, with foam material of some significant thickness, is more effective also in mid and low (bass) absorption frequencies, than the flat mounted acoustic foam which rarely has the thickness of POLYFON-BT. Dimensions: 500 x 210 x 460 mm Color: Dark grey. Packing: Box of 2 pieces. Reaction to fire: SE according to FMVSS302. The Diffuser Membrane (DM) is a flexible membrane, with a smooth radius, which creates a 2D deflector that effectively spreads high frequency reflections. Additional the DM improves the low frequency absorption coefficient; it acts as a sound absorption membrane. The DM element can be either acrylic, plywood, HPL “formica” or others radius membranes. It can be easily removed from the two lateral channels, which keep the membrane in tension. Type: POLYFON-BT Practical Sound Absorption Coefficient (α p ) Weighted Sound Absorption Coefficient (α w) Sound Absorption Class Frequency (Hz) 125 250 500 1000 2000 4000 POLYFON-BT.500 0.8 0.9 0.85 0.95 0.9 0.95 0.95 A POLYFON-BT Base DM (Diffuser Membrane) Section View 460mm 210mm The Diffuser Membrane (DM) is a flexible membrane, with a smooth radius, which creates a 2D deflector that effectively spreads high frequency reflections. Additional the DM improves the low frequency absorption coefficient; it acts as a sound absorption membrane. The DM element can be either acrylic, plywood, cork, HPL “formica” or others radius membranes. It can be easily removed from the two lateral channels, which keep the membrane in tension. Design Patent Pending. Sound absorption coefficients αp, according to ISO 11654:1997.